Analysis on petroleum preservation condition in the coupling area between Longmen Mountain and Sichuan Basin
Online published: 2011-02-20
The coupling area between Longmen Mountain and Sichuan Basin across western Sichuan Depression and Longmen Mountain mainly includes the front range and the front of Longmen Mountain, and the two parts are separated by the Guanxian- Jiangyou （Guankou） fault. Due to multiple phase of thrust nappe, there developed a large number of faults in the coupling area, and the strata suffered from erosion. Therefore, the petroleum preservation conditions are crucial for the petroleum exploration in this area. Based on the distribution of caprocks, fluid pressure and surface bitumen, combined with earthquake epicenters distribution, the petroleum preservation conditions in the coupling area are analyzed. And it is concluded that: it suffered from uplift-erosion in the hanging wall of Guanxian- Jiangyou fault, and large area of the Late Paleozoic strata outcropped, so the petroleum preservation condition here is destroyed; there exists gypsum mudstone in the footwall of Guanxian- Jiangyou fault, so the petroleum preservation condition of deep marine layers is well, therefore, it is favorable exploration area; the strata developed completely in the front of Longmen Mountain, so the petroleum preservation conditions is well.
Key words： conventional logging; claymineral content; grey theory
CHEN Ganghua , YANG Ye . Analysis on petroleum preservation condition in the coupling area between Longmen Mountain and Sichuan Basin[J]. Lithologic Reservoirs, 2011 , 23(1) : 79 -85 . DOI: 10.3969/j.issn.1673-8926.2011.01.013
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